Method of making bolts.



J. A. FRAUENHEIM.

METHOD OF MAKINGBOLTSv APPLICATION FILED APR-7.19M.

Patented July 2, 191 8.

ZSHEETSSHEE T I.

WITNESSES mm mm INWENTOR with erarne JOSEPH A. FRAUENHEIIVI, 0F ZELIENOPLE, PENNSYLVANIA, ASSIGNOR T0 KERNER MANUFACTURING GOMPAN ,OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Mn'rnon or MAKING BOLTS.

Specification of Letters Patent.

Patented duly a, rare.

Application filed April 7, 1914:. Serial No. 830,140.

To all whom it may concern Be it known that l, JOSEPH A. FRAUEFF HEIM, a citizen of the United I States of America, residing at 'Zelienople, in the.

county of Butler and State of Pennsylvania,

have invented a new and useful Improve ment in Methods of Making Bolts, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation of one form of blank for making the bolt by one method of my improved invention.

Fig. 2 is a section on the line 11-11 of" Fig. l i g L Fig. 8- is a view similar to Fig. 1, showing the blank after it has passed through the first step of my method.

Fig. t is a section on the line lV-IV of Fig. 3.

Fig. 5 is a side elevation of blank after it has passed through a portion of the sec ond step.

Fig. 6 is a sectional view on the line VL- VlofFig.5. 1'

Fig. 7 is a side elevation of a blank after it has passed through the second step.

Fig. 8 is a section on the line VIII-VIII of Fig. 7.

Fig. 9 is a view of the blank after it has been twisted.

Fig. 10 is a section on the line X-X of Fig. 9.

section, of a finished bolt.

Fig. 12 is an end view thereof.

Fig. 13 is a side elevation of another form of blank afterit has passed through the first step of the method.

Fig. 14 is a similar view of the same blank after it has passed through the second step and has been threaded.

Fig. 15 is a sectional view through one form of die for carrying out the first step of my improved method.

Fig. 16 is a similar view through, a die for compressing a central or body portion of the bolt for carrying out the second step or my method.

Fig. 17 is a sectional view through a set of rolls which may also be used for carrying out the second step of my method, and

Fig. 11 is a side elevation partially Fig. 18 is a plan view of the rolls shown in Fig. 17.-

This invention relates to animprovement in making bolts, and particularly stay bolts for steam boilers. I

The object of my invention is to provide a method wherebyl can readily and cheaply make a bolt having a body portion comprised of a plurality of members which ex-fl tend from head to head at the ends there-v on, and in which the body portion is of reduced diameter and is provided with the outer scale and at the same time in which lit the heads are formed from a solid piece of metal.

In manufacturing these bolts by one of my methods, it take a blank of approximately the diameter or slightly greater than the diameter of the head and then punch out a portion of the center of the blank,

after which I reduce the body portion be I tween the heads, and then finish the bolts in the ordinary manner.

I am aware that it 1s old to form bolts several times between the difi'erent opera} of a plurality of members, upset; and weld the head portions to form headsof a greater diameter than the body portion, then twist the body and thread the headspfBy this method it is necessary to heat the blank tions and at the same time care must be taken so as not to weld the two members together beyond the heads. By my improved method, I am enabled to overcome several of the heating steps and at the same time be assured that the two members forming the body portions arenot welded to each other beyond the desired point, and form a bolt having all the desirable qualities of the bolt made from two members.

I am also aware thatit is old to form bolts from a single member which has been.

attacked by the acids and heavy matter contained in the feed water for the boilers.

strength of the bolt and at the same time 1 provides a surface which is more readily The precise nature of my invention will be best understood by reference to the accompanying drawings, which will now be described, it being premised, however, that various devices 3 maybe used to carry out my invention, and also that some of .the steps may be changed without departing from the spirit .andscope of my invention, as defined'in' the appended claims.

Referring to the accompanying drawings, the reference character 2 designates a blank whiclrmay .be first heatedand then. placed between a pair of members 3-3 forming one portion of a punching die, and 4 is a die which is arranged to be moveddownwardly and punch out the portion designated .in dotted rlinesinlFig. 15 of the blank 2. This firststepbfthemethod will form a blank, such as shown in Figs. 3 and 1, in; which the blank2is provided. with a longitudinally extending opening 5 through the blank. The blank is then placed between a pair of dies 16.6, :as shown in Fig. 16, one of which is movablerelative tothe other, to close the opening-5 of the iblank -as. shown therein. The blank, after it has passed through the second-step, is shown in Figs. 5 and 6. The dies arethen opened and the blank rotated and the dies a 'ain-closed, which process of opening and'c osing the diesand rotating the blank is repeated-a number of times in order toireduce the centralor body portion ofwthe blank'2 to form a structure such as shown in Figs. 7 and 8. The blank is then twisted atleast 90, as shown in Figs. 9 and 10,-afterwhich the heads are milled off and threaded, as shown in Figs. 1-1 and 12.. The

ends-of the bolt. may be provided with a so'cket,'such as'shown at .7, for receiving a wrench ormay :be squared, as shown ati8.-

9 designates .a'tell-tale hole'whichis' drilled frointhecenter of one=of the heads at an angle tothe axis of the bolt, sothat the inner end :of the tell-tale hole will be opposite the solid metal of one of the body members extendingfrom head-to head.

It' 'will readily be understood by those familiar: withthe art that a bolt made in accordance with my invention will be perfectlystraightafter it has been operated upon by the die's shown in Fig. 16.

'I f'desired, the step of reducing the body portion and closing the'slot, can be'accomplished by a set of rolls 10,11 and 12, as indicated in-Figs- 17 and 18. The roll 12 is arranged to'be moved'in a vertical direction-with relation to the rolls 10 and 11 so as to permit the blank to be inserted between the rolls. The roll 12 is then moved toward the' rolls'10' and 1-1 the proper distance to produce a=blankhaving abody and head portions of the proper'diameters.

If desired, these rolls may be provided with a plurality of removable collars, such as indicated at 13, so that bolts of varying length can be operated upon by the same set of rolls. V

In Figs. 13 and 14-, I have shown blanks which have been operated upon by what might be termed a continuous process.

When carrying out my invention by this process, I heat a long .bar, such as is shown in Fig. 13 to the proper temperature, punch out a portion,s.uch as indicated at 5, then move the blank forward a predetermined distance and punch out a second portion, such. as indicated at 5". The body portions of the various bolts in the continuous blank are thenoperatedupon in any desired manner in order to close the slots and reduce said body portions, after which the bolts may be twisted and then cut apart and threaded, or they may be first threaded, as shown in Fig. 14: and afterward cut apart.

It will also be understood by those familiar with the art thatafter the blanks have been twisted, as shown in Fig. 9, they may be inserted in adie, such as shown in Fig. 16, to again straighten them, or may be rolled between rolls such as shown in Figs. 17 and 18; or, if desired, the blank, such as shown in- Fig. 3, may be twisted before the body portion is reduced. I

The advantages of my invention result from the provision of the method. of making the bolt, in which I produce a bolt having a reduced body portion which is. provided with the initial scale causedcby theworking of the metal and in which a bolt can be made with one heating operation.

Furthermore, from the provision of a methodin which the bolts will be absolutely straight andin which the heads are formed of one integral piecea 1 By this method of making bolts, I am enabled to greatly increase the output and at the some time materially reduce the cost of manufacture and produce a'bolt which has all of the advantages of bolts made of two pieces.

I claim: 1

1. The herein described method of manufacturing stay bolts, having ends of larger diameter than its body portion, which consists in providing a blankof substantially the diameter of the enlarged head portions of the finished bolt, removing from the central body-forming portion thereof a longitudinally extending portion of the metal terminating at said end portions, then squeezing in said central portion, and then twisting said squeezed-inportion about its longitudinal axis, substantially as described.

2. The method of making stay bolts having threaded end heads of a larger diameter than the body, consisting in providing a ennon hum eter being approximately equal to the final the larger diameter end portions, substandiemeter of the threaded head, transversely tially as described. 10 forming a longitudinal opening through the In testimony whereof, I have hereunto set intermediate portion only of the blank and my hand.

5 stopping short of the head-forming por- JUSEPH A. FRAUENHEIM.

tions thereof, squeezing inwardly the said, itnesses: intermediate portion of the blank, twisting R. HARRIS, the said intermediate portion, and threading H. T. KnRNnR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

newton, n, U. 

